Seiko Cal. 7143 - 421

This Spring Drive model from 1977 features a 41mm Stainless Steel case. Powered by the 7143 caliber with 36j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-6ca575deff80]

Also known as: Helmet, Emperor

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

13.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

White

Jewels

36j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1977

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